**Sergey Grigoriev 1, Alexey Vereschaka 2,\*, Filipp Milovich 3, Nikolay Sitnikov 4, Nikolay Andreev 3, Jury Bublikov 2, Catherine Sotova 1, Gaik Oganian <sup>1</sup> and Ilya Sadov <sup>1</sup>**


Received: 9 November 2020; Accepted: 13 December 2020; Published: 16 December 2020

**Abstract:** The article describes the results of an investigation focused on the properties of the Ti-TiN-(Ti,Cr,Mo,Al)N multilayered composite coating with a wear-resistant layer of nanolayer structure. A transmission electron microscope was used to study the coating structure. The examination of the phase composition using selected area diffraction electron pattern has detected the presence of two phases, including c-(Ti,Cr,Mo,Al)N and h-AlN. The cutting properties of the tool with the coating under consideration were studied during the turning of AISI 1045 steel at vc = 300 m/min, f = 0.25 mm/rev, and ap = 1.0 mm. After 16 min of cutting, the wear rate for the tool with the Ti-TiN-(Ti,Cr,Mo,Al)N coating was 1.9 times lower compared to the wear rate for the tool with the (Ti,Al)N commercial monolithic coating. As a result of the investigation focused on the fracture pattern on the coating during the cutting, the brittle nature of the fracture has been detected with a noticeable effect of adhesive fatigue mechanisms.

**Keywords:** nanolayered coating; microparticles; crack formation; tool wear
